Search Publications
The Cosmic Ultraviolet Baryon Survey (CUBS) - I. Overview and the diverse environments of Lyman limit systems at z < 1
Weiner, Benjamin J.; Faucher-Giguère, Claude-André; Johnson, Sean D. +19 more
We present initial results from the Cosmic Ultraviolet Baryon Survey (CUBS). CUBS is designed to map diffuse baryonic structures at redshift z ≲ 1 using absorption-line spectroscopy of 15 UV-bright QSOs with matching deep galaxy survey data. CUBS QSOs are selected based on their NUV brightness to avoid biases against the presence of intervening Ly…
Probing the size and charge of polycyclic aromatic hydrocarbons
Peeters, E.; Maragkoudakis, A.; Ricca, A.
We present a new method to accurately describe the ionization fraction and the size distribution of polycyclic aromatic hydrocarbons (PAHs) within astrophysical sources. To this purpose, we have computed the mid-infrared emission spectra of 308 PAH molecules of varying sizes, symmetries, and compactness, generated in a range of radiation fields. W…
Stellar population models based on the SDSS-IV MaStar library of stellar spectra - I. Intermediate-age/old models
Stassun, K.; Bizyaev, D.; Chen, Y. +14 more
We use the first release of the SDSS/MaStar stellar library comprising ∼9000, high S/N spectra, to calculate integrated spectra of stellar population models. The models extend over the wavelength range 0.36-1.03 µm and share the same spectral resolution ( $R\sim 1800$ ) and flux calibration as the SDSS-IV/MaNGA galaxy data. The parameter space cov…
Efficient solution of the anisotropic spherically aligned axisymmetric Jeans equations of stellar hydrodynamics for galactic dynamics
Cappellari, Michele
I present a flexible solution for the axisymmetric Jeans equations of stellar hydrodynamics under the assumption of an anisotropic (three-integral) velocity ellipsoid aligned with the spherical polar coordinate system. I describe and test a robust and efficient algorithm for its numerical computation. I outline the evaluation of the intrinsic velo…
High-mass X-ray binaries in nearby metal-poor galaxies: on the contribution to nebular He II emission
Charlot, Stéphane; Stark, Daniel P.; Mulchaey, John S. +4 more
Despite significant progress both observationally and theoretically, the origin of high-ionization nebular He II emission in galaxies dominated by stellar photoionization remains unclear. Accretion-powered radiation from high-mass X-ray binaries (HMXBs) is still one of the leading proposed explanations for the missing He+-ionizing photo…
Megaparsec-scale structure around the protocluster core SPT2349-56 at z = 4.3
Greve, Thomas R.; Spilker, Justin; Aravena, Manuel +20 more
We present an extensive ALMA spectroscopic follow-up programme of the z = 4.3 structure SPT2349-56, one of the most actively star-forming protocluster cores known, to identify additional members using their [C II] 158 µm and CO(4-3) lines. In addition to robustly detecting the 14 previously published galaxies in this structure, we identify a…
High molecular gas content and star formation rates in local galaxies that host quasars, outflows, and jets
Thomson, A. P.; Alexander, D. M.; Mainieri, V. +11 more
We use a sample of powerful $z\, \approx \, 0.1$ type 2 quasars ('obscured'; log [LAGN/erg s $^{-1}]\, \gtrsim \, 45$ ), which host kpc-scale ionized outflows and jets, to identify possible signatures of AGN feedback on the total molecular gas reservoirs of their host galaxies. Specifically, we present Atacama Pathfinder EXperiment (APE…
The Hi-GAL catalogue of dusty filamentary structures in the Galactic plane
Umana, G.; Moore, T. J. T.; Palmeirim, P. +27 more
The recent data collected by Herschel have confirmed that interstellar structures with a filamentary shape are ubiquitously present in the Milky Way. Filaments are thought to be formed by several physical mechanisms acting from large Galactic scales down to subparsec fractions of molecular clouds, and they might represent a possible link between s…
Time-delay cosmographic forecasts with strong lensing and JWST stellar kinematics
Suyu, Sherry H.; Yıldırım, Akın; Halkola, Aleksi
We present a joint strong lensing and stellar dynamical framework for future time-delay cosmography purposes. Based on a pixelated source reconstruction and the axisymmetric Jeans equations, we are capable of constraining cosmological distances and hence the current expansion rate of the Universe (H0) to the few per cent level per lens,…
The gas production of 14 species from comet 67P/Churyumov-Gerasimenko based on DFMS/COPS data from 2014 to 2016
Altwegg, Kathrin; Rubin, Martin; Läuter, Matthias +1 more
The coma of comet 67P/Churyumov-Gerasimenko has been probed by the Rosetta spacecraft and shows a variety of different molecules. The ROSINA COmet Pressure Sensor and the Double Focusing Mass Spectrometer provide in situ densities for many volatile compounds including the 14 gas species H2O, CO2, CO, H2S, O2